Cobra C3510/20 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
20-Turn Delta 1000 RPM/Volt Io = 1.06 Amps @ 14v Rm = 0.040 Ohms 32 Amps 470 W 
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
43.0 mm,  1.69 in. 36.0 mm,  1.42 in. 58.0 mm,  2.28 in. 5.00 mm,  0.197 in. 141 gm,   4.97 oz
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 8x8-E 11.1 17.52 194.4 8,875 67.2 679 23.95 3.49
APC 9x4.7-SF 11.1 13.25 147.1 9,296 41.4 913 32.20 6.21
APC 9x6-E 11.1 14.54 161.4 9,164 52.1 879 31.01 5.45
APC 9x6-SF 11.1 24.74 274.6 8,202 46.6 1119 39.47 4.07
APC 9x7.5-E 11.1 21.19 235.3 8,527 60.6 921 32.49 3.91
APC 9x7.5-SF 11.1 28.11 312.0 7,887 56.0 1074 37.88 3.44
APC 9x9-E 11.1 24.80 275.3 8,208 70.0 900 31.75 3.27
APC 10x3.8-SF 11.1 21.96 243.8 8,465 30.5 1332 46.98 5.46
APC 10x4.7-SF 11.1 23.21 257.6 8,355 37.2 1360 47.97 5.28
APC 10x5-E 11.1 17.48 194.0 8,874 42.0 1105 38.98 5.70
APC 10x6-E 11.1 18.77 208.3 8,702 49.4 1166 41.13 5.60
APC 10x7-E 11.1 21.74 241.3 8,480 56.2 1239 43.70 5.14
APC 10x7-SF 11.1 32.03 355.5 7,557 50.1 1422 50.16 4.00
APC 10x10-E 11.1 30.62 339.9 7,661 72.5 1030 36.33 3.03
APC 11x3.8-SF 11.1 24.68 273.9 8,204 29.5 1512 53.33 5.52
APC 11x4.7-SF 11.1 28.41 315.4 7,846 34.9 1639 57.81 5.20
APC 11x5.5-E 11.1 23.53 261.2 8,328 43.4 1456 51.36 5.57
APC 11x7-E 11.1 27.29 302.9 7,959 52.8 1511 53.30 4.99
APC 11x7-SF 11.1 37.63 417.7 6,955 46.1 1704 60.11 4.08
APC 11x8-E 11.1 28.88 320.6 7,816 59.2 1439 50.76 4.49
APC 11x8.5-E 11.1 30.81 342.0 7,597 61.2 1443 50.90 4.22
APC 12x3.8-SF 11.1 35.28 391.6 7,251 26.1 1893 66.77 4.83
APC 12x6-E 11.1 29.32 325.4 7,782 44.2 1723 60.78 5.29
APC 12x8-E 11.1 35.62 395.4 7,219 54.7 1480 52.20 3.74
APC 13x4-E 11.1 23.82 264.4 8,276 31.3 1645 58.03 6.22
MAS 8x6x3 11.1 13.18 146.3 9,302 52.9 776 27.37 5.30
MAS 9x7x3 11.1 20.11 223.3 8,629 57.2 1148 40.49 5.14
MAS 10x5x3 11.1 18.08 200.7 8,811 41.7 1186 41.83 5.91
MAS 10x7x3 11.1 25.02 277.7 8,141 54.0 1413 49.84 5.09
MAS 11x7x3 11.1 29.57 328.2 7,756 51.4 1623 57.25 4.95
MAS 11x8x3 11.1 32.02 355.5 7,518 57.0 1670 58.91 4.70
MAS 12x6x3 11.1 32.44 360.1 7,470 42.4 1803 63.60 5.01
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 8x4-E 14.8 14.06 208.1 12,422 47.1 1006 35.49 4.83
APC 8x6-E 14.8 21.60 319.6 11,602 65.9 1163 41.02 3.64
APC 8x8-E 14.8 27.53 407.4 10,945 82.9 1038 36.61 2.55
APC 9x4.5-E 14.8 19.88 294.3 11,774 50.2 1423 50.19 4.84
APC 9x6-E 14.8 22.89 338.7 11,458 65.1 1382 48.75 4.08
APC 9x7.5-E 14.8 33.93 502.1 10,365 73.6 1386 48.89 2.76
APC 10x5-E 14.8 27.70 409.9 10,973 52.0 1718 60.60 4.19
APC 10x6-E 14.8 29.68 439.2 10,791 61.3 1820 64.20 4.14
APC 10x7-E 14.8 33.47 495.4 10,394 68.9 1902 67.09 3.84
MAS 8x6x3 14.8 20.10 297.5 11,757 66.8 1306 46.07 4.39
MAS 9x7x3 14.8 30.38 449.6 10,729 71.1 1806 63.70 4.02
MAS 10x5x3 14.8 27.49 406.9 10,999 52.1 1865 65.79 4.58
MAS 10x7x3 14.8 37.96 561.8 9,964 66.0 2155 76.01 3.84
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 7x4-E 18.5 13.38 247.4 15,634 59.2 1027 36.23 4.15
APC 7x5-E 18.5 17.25 319.1 15,159 71.8 1055 37.21 3.31
APC 7x6-E 18.5 17.76 328.6 15,029 85.4 1127 39.75 3.43
APC 8x4-E 18.5 20.31 375.7 14,724 55.8 1439 50.76 3.83
APC 8x6-E 18.5 32.32 597.9 13,482 76.6 1596 56.30 2.67
APC 9x4.5-E 18.5 28.59 528.8 13,809 58.8 2050 72.31 3.88
APC 9x6-E 18.5 32.66 604.2 13,379 76.0 1921 67.76 3.18
MAS 8x6x3 14.8 27.83 411.9 13,949 79.3 1861 65.64 4.52
Propeller Chart Color Code Explanation
   The prop is to small to get good performance from the motor. (Less than 50% power)
   The prop is sized right to get good power from the motor. (50 to 80% power)
   The prop can be used, but full throttle should be kept to short bursts. (80 to 100% power)
   The prop is too big for the motor and should not be used. (Over 100% power)
PLEASE NOTE: 
The data contained in this prop chart is based on actual measurements taken in a controlled test 
environment.  The test voltages used are based on a properly sized Li-Po battery for the current
draw of the motor being tested.  If you are using a larger than normal capacity battery, or a very
high C-Rated battery, your actual voltages will be higher than those shown in this chart, and this
will result in higer current draw for each prop used.  You should always test your power system
with a watt meter whenever a prop is used to ensure that you are not exceeding the recommended
rating of the motor being used.  The prop recommendations in this chart are based on the motor
receiving adequate cooling throughout its operation.  If your motor is being used inside a cowl, you
must provide adequate cooling to the motor and make sure that the motor is not getting too hot
during operation.